=== JUnit4 tests ===
(Note mcomella 5/5/16: they don't all pass for me locally. see [https://bugzilla.mozilla.org/show_bug.cgi?id=1271000 bug 1271000])
* Runs on [http://robolectric.org/ Robolectric], which mocks various Android libraries so you can write unit tests for Android libraries that would ordinarily have to be run on device
* Supports [http://mockito.org/ Mockito] for custom mocking (see [http://mxr.mozilla.org/mozilla-central/source/mobile/android/tests/background/junit4/src/org/mozilla/gecko/dlc/TestVerifyAction.java TestVerifyAction for a sample]).